The active option is the design option that is currently being edited. If you are editing an option, the current view displays the main model and the active option.
To determine whether you are currently editing a design option, use one of the following methods:
If the status bar does not display the active design option, enable this feature by clicking View tab
Windows panel
User Interface drop-down
Status Bar - Design Options.
Design Options panel. The drop-down list indicates the design option that is currently being edited. Changes that you make will affect the active option.

If the drop-down list displays Main Model, you are not currently editing a design option.